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M 20 - The Triffid Nebula Date/time: 12.08.2010 21:50 to 12.08.2010 22:05 Az./Alt. positions: 180° / 24° to 182° / 24° Ambient conditions: 20°C, transparency 3/5, seeing 3/5, cloudy Location: Villa Tatti, Tuscany, Italy Equipment: Telescope: Deltagraph 300mm f/3.3 Mount: CGE Camera: SXVF-M25C Guiding scope: Orion short tube 80mm f/5 Guiding camera: ATIK 16IC Filters: IDAS LPS Acquisition: Software: Maxim DL 5 FOV, Image scale: 62.5 x 54.8 arcmin, 1.62 arcs/pixel Sub-exposures: 15 min (5 x 3min) light frames No darks, 100 bias, 50x0.2s flats Processing: Images Plus 3.75: Calibration of light frames with bias and flats, DDP Maxim DL: Stacking of calibrated frames with SDMask, Color balance R85:G100:B120 CS3: Levels, GradientXterminator, noise reduction with Carbonis Actions Comments: This object was very low on horizon and was highly effected by sky glow and light polllution. Nevertheless the S/N surprised me and the quality for only 15 min total exposure is acceptable. The flat and light frames have been calibrated with the same masterbias taken at about 18°C.
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very nice photo!
keep on the good work!